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db:migrateruns (single) migrations that have not run yet. db:createcreates the database db:dropdeletes the database db:schema:loadcreates tables and columns within the (existing) database following schema.rb db:setupdoes db:create, db:schema:load, db:seeddb:resetdoes db:drop, db:setup Normally, db:migrate used after having made changes to the schema via new migration files after creating db i.e when db already exists. db:schema:load is used when you setup a new instance of your app.